共查询到16条相似文献,搜索用时 62 毫秒
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负载模拟器可以模拟飞行器飞行过程中受到的空气力矩,是重要的半实物仿真设备之一。论述了系统的基本组成结构,并建立电动负载模拟器的数学模型,详细分析了多余力矩的产生原因与消除方法以及提高电动负载模拟器的动态性能策略。通过仿真可以看出,提出的复合控制抑制多余力矩的方法,在一定程度上消除了多余力矩,保持了跟踪给定。对现实的研究有一定的参考作用,对电动加载系统的进一步研究有借鉴作用。 相似文献
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基于迭代学习的电动负载模拟器复合控制 总被引:2,自引:0,他引:2
为保证电动负载模拟器力矩精确加载,设计了基于迭代学习控制和舵机位置前馈补偿结合的复合力矩控制器.引入弹性杆结构以提高系统稳定性及加载精度,并从系统响应速度、频宽及稳定性等方面对弹性杆刚度约束进行了分析.建立了控制系统模型,在三闭环结构基础上,引入了舵机位置前馈补偿.为保证正弦负载模拟效果,设计了基于指令力矩幅值和相位修正的迭代学习控制器,并基于P型控制器实现对幅值和相位的迭代学习.最后,分别进行了力矩加载及多余力矩抑制实验,结果证明了该方法的可行性及有效性. 相似文献
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本文介绍了一种克服多余力的新方法,给出了位置同步补偿克服负载模型器多余力的工作原理,并对多余力进行了实验研究。 相似文献
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介绍了CMAC网络的控制原理,给出了CMAC网络与PID复合控制的控制器设计步骤,并将该方法应用到某电液位置伺服系统中.仿真结果表明,该方法能获得良好的跟踪性能,具有一定的鲁棒性,对于抑制并消除系统的不确定性具有良好的控制效果. 相似文献
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一种基于模糊CMAC神经网络的自学习控制器 总被引:6,自引:0,他引:6
通过分析模糊控制和基于广义基函数的CMAC神经网络,提出一种模糊CMAC(FCMAC)神经网络。通过FCMAC权系数的在线学习,实现修正模糊逻辑。给出一种基于FCMAC的自学习控制器的结构及合适的学习算法,这种网络每次学习少量参数,算法简单。仿真结果表明所提出的控制器优于传统的PID控制器。 相似文献
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通过分析电动负载模拟器的基本结构和工作原理,建立数学模型并且分析了多余力矩产生的机理,提出一种重复控制和PID控制相结合的复合控制策略,利用重复控制改善系统的稳态特性,利用PID控制改善系统的动态特性.仿真结果表明,所采用的方控制方法能够有效地抑制多余力矩,提高了系统的稳态精度和动态性能. 相似文献
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针对受非完整约束的移动机器人的轨迹跟踪问题,提出了一种基于模糊CMAC的轨迹跟踪控制策略。该策略利用模糊CMAC神经网络逼近移动机器人动力学模型的非线性和不确定,同时与速度误差结合起来构成力矩控制器,并用滑模项来补偿不确定性扰动对系统的影响。李亚普诺夫稳定性定理保证了系统的稳定性和跟踪误差的渐近收敛,仿真结果进一步验证了所提方法的有效性。 相似文献
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为了更加便捷的开展航天器各项大型试验和测试工作,研制了一种电子负载模拟器。电子负载模拟器能够模拟航天器电气系统的压力传感器、电磁阀、自锁阀、温度传感器、火工品等负载的电压和电流信号特性,并完成负载电压的采集和负载通电时间的统计,同时将所有功能模块集成到一个标准机箱中,所有电气信号接口通过若干接插件汇总对外进行连接,各功能模块通过上位机软件进行通信和控制。电子负载模拟器参与了某型号航天器的模飞测试工作,测试数据准确无误且性能稳定,既验证了上游驱动电路的电气匹配特性,又节省了梳理负载电缆和插拔接插件的繁琐性,同时也降低了人员频繁插拔接插件的出错概率。 相似文献
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Owing to the complex nonlinearities of the electric load simulator (ELS) for the gun control system (GCS), the surplus torque plays a great negative impact on the performance of the loading system. This paper proposes a variable-structure wavelet-neural-network (VSWNN) identification strategy based on adaptive differential evolution (ADE). First of all, a mathematical model is established based on the structure and the working principle of the ELS. Then an intelligent identification method is applied, where the wavelet function is chosen as the excitation function, which improves the generalization and approximation ability of the neural network. The ADE is used to optimize the parameters, which solves the difficulty of determining the structure of the WNN. In order to reduce the computation complexity and speed up the convergence of the identification system, the adaptive laws of the pitch adjusting rate (PAR), band width (BW) and variable numbers of neurons are proposed. Finally, a pseudo random multilevel signal and a linear frequency modulation signal are chosen as input signals for the hardware-in-the-loop simulation. The test results show that the proposed ADE-VSWNN algorithm has superior validity and practicability, especially when the identification algorithm is used in the working circumstances with different inertial torque. Further, the high precision and strong robustness of the identification algorithm are further verified. 相似文献
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D. K. Chaturvedi M. Mohan R. K. Singh P. K. Kalra 《Soft Computing - A Fusion of Foundations, Methodologies and Applications》2003,8(1):10-18
The conventional neural networks consisting of simple neuron models have various drawbacks like large training time for complex problems, huge data requirement to train a non linear complex problems, unknown ANN structure, the relatively larger number of hidden nodes required, problem of local minima etc. To make the Artificial Neural Network more efficient and to overcome the above-mentioned problems the new improved generalized neuron model is proposed in this work. The proposed neuron models have both summation () and product () as aggregation function. The generalized neuron models have flexibility at both the aggregation and activation function level to cope with the non-linearity involved in the type of applications dealt with. The training and testing performance of these models have been compared for Short Term Load Forecasting Problem. 相似文献
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The conventional neural networks consisting of simple neuron models have various drawbacks like large training time for complex problems, huge data requirement to train a non linear complex problems, unknown ANN structure, the relatively larger number of hidden nodes required, problem of local minima etc. To make the Artificial Neural Network more efficient and to overcome the above-mentioned problems the new improved generalized neuron model is proposed in this work. The proposed neuron models have both summation () and product () as aggregation function. The generalized neuron models have flexibility at both the aggregation and activation function level to cope with the non-linearity involved in the type of applications dealt with. The training and testing performance of these models have been compared for Short Term Load Forecasting Problem. 相似文献